JPH0221754Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a drying furnace for immersion lances with refractory linings used in metal refining where the lance is immersed in molten metal and injected with stirring gas or powdered reactants. .

(Prior Art) A drying oven using hot air is often used to dry an immersion lance having a regular or irregular refractory lining. One example of this will be explained with reference to the schematic sectional view of the drying oven in FIG.

The ceiling portion 1a of the sealed box-shaped furnace body 1 is configured as a lid-like body that can be opened and closed, and a box-shaped pedestal 2 is fixed inside the furnace. Receiving washers 3 are mounted in parallel on the upper surface of the box-shaped pedestal 2, and the immersion lance 4 is inserted into the furnace by opening the ceiling portion 1a and placed on the receiving washers 3.

A duct 6 is provided on the side wall 5a and connected to an air heating device 7. Heating air is sent from the blower 8 to the air heating device 7, heated, and blown into the furnace from the duct 6.

Reference numeral 9 denotes an exhaust duct provided on the side wall 5b, and an exhaust amount control damper 10 is provided inside the exhaust duct. In order to raise the temperature inside the closed box furnace body 1 according to a desired temperature increase curve, in addition to heating control of the air heating device 7, air flow control of the blower 8 and control operation of the displacement control damper are performed. It can be done.

In addition, there are cases where a ``multi-stage box-type drying device'' is adopted, as described in ``New Edition of Thermal Management Technology Lectures'' published by Maruzen Co., Ltd. in 1963, page 393, but it does not function as a drying oven. , there is no big difference in the action between the two.

(Problem that the invention aims to solve) As mentioned above, drying ovens have many incidental equipment such as blowers, air heating devices, and displacement control dampers, and adding these control devices requires a large initial investment. In addition to this problem, as methods using immersion lances in metal refining have recently become larger in scale, immersion lances have become gigantic, which not only increases production costs but also makes handling and drying them extremely difficult.

In other words, the length of such an immersion lance is, for example, 2500 to 4000 mm, the length of the bent part is 500 to 1500 mm,
It has a diameter of 300 to 450 mm and a weight of 2 to 3 tons.

In order to dry such a huge immersion lance within the desired time without causing it to explode, it is necessary to precisely control the temperature inside the furnace from room temperature and maintain it at a predetermined temperature. It is necessary to equalize the temperature of each part of the furnace and to maintain good circulation of the atmosphere gas in the furnace to prevent localized low-temperature or high-temperature regions.

Additionally, handling the immersion lance quickly and efficiently is an important factor in reducing drying costs, but if a dedicated transport device is provided for this purpose, the problem arises that the initial equipment cost increases.

Conventional drying ovens do not seem to solve the above problems.

The purpose of this invention is to provide a drying oven that has a simple structure, requires low initial capital investment, is capable of efficient drying, and has good workability.
Another objective is to provide a drying oven with uniform temperature distribution within the oven and high thermoeconomic efficiency.

(Means for solving the problem) In other words, in an immersion lance drying oven, a pedestal on which a plurality of immersion lances are mounted in parallel in a recumbent position;
A platform on which the platform is mounted so that the platform can be climbed on and off, a lance loading truck equipped with a sealing front door at the end of the platform and movably mounted on a track via wheels, and the lance loading truck. It has a traction device that can move forward and backward, an exhaust pipe on the ceiling, a gas or liquid fuel combustion device at asymmetrical positions on opposite side walls, and an inner cavity that receives the lance loading truck so that it can move in and out. The present invention has been solved by adopting a structure consisting of a heat-resistant furnace body which forms a substantially hermetic state when the lance loading cart is in the closed state.

(Function) Next, the details of one embodiment of the present invention are shown in FIGS. 1 and 2.
This will be explained with reference to FIG.

FIG. 1 is a side view of the drying oven 22 according to the present invention, showing the state in which the lance loading cart is drawn out using imaginary lines.

The oven body 23 of the drying oven 22 has a frame composed of columns 24 and beams 25, and the inside is covered with a refractory lining and the outside is covered with an iron shell. Reference numeral 26 denotes an exhaust pipe provided on the ceiling, and a gas or liquid fuel combustion device such as a COG burner 27a (hereinafter simply referred to as burner) is provided on the side wall.

The lance loading truck 8 (hereinafter simply referred to as a truck) has wheels 29a and 29b and is mounted on a track (not shown) so as to be able to move forward and backward. The front sealing door 30 is fixed, and the platform 28 on the back side of the front sealing door 30 is fixed.
A is provided with a space on which the pedestal 31 can be mounted so as to be freely mountable and dismountable.

The pedestal 31 has a plurality of immersion lances 32 (the pedestal 3
1: The immersion lance 32 (shown by imaginary lines for convenience of explanation) is constructed of a box-shaped frame body that is flat or has an upper surface with a seat for the immersion lance 32 so that the immersion lance 32 (shown by phantom lines for convenience of explanation) can be mounted in parallel in a lying position. , with the immersion lance 32 still mounted on the pedestal 31 by a crane or hoist (not shown), the pedestal 28 is
It is possible to get on and off the vehicle a.

Next, 33a and 33b are pulleys, and one end of a wire rope 34c is latched to a rope 34a (indicated by reference numeral 34b in the pulled out position) fixed to the lower side of the platform 28a of the trolley 28. Further, the wire rope 34c is stretched around the pulleys 33a and 33b to form a wire rope type traction device 35. This wire rope type traction device 35 is operated using a drive device, an overhead crane, etc. (not shown).

Next, 36 is a handrail fixed to the front surface of the platform 28a of the trolley 28, which is used for safety work such as sealing the furnace body 23 and the sealing front door 30 (hereinafter simply referred to as the front door) when pushing the trolley, which will be described later. Make use of it.

The head 32 of the immersion lance 32 is further shown in phantom.
a corresponds to the part from the pedestal 12 of the immersion lance explained in FIG. 3 to the upper mounting flange 11, and when the cart 28 is pushed in, the furnace body 2
It is placed on the pedestal 31 so as to protrude outward from the frame 31. Since the head 32a is usually made of metal, such as steel, there is no need to dry it, so this configuration has a large energy saving effect.

Next, FIG. 2 is a schematic front view of the drying oven of the present invention, showing a state in which the cart 28 is placed in the oven body 23. Second
The handrail 36 is not shown in the figure for convenience of explanation.

As shown in the figure, the furnace body 23 has an inner cavity into which the carriage 28 can freely move in and out, and forms a substantially sealed state when the carriage 28 is inserted.

In Fig. 2, 37a and 37b are the foundation members 38.
The carriage 28 is movably mounted on the tracks 37a and 37b by wheels 29b and 29c, as described above.

39 is a trough that accommodates the wire rope pulling device 35 including the pulley 33b.

Furthermore, 40 is a front eave part that is joined to the ceiling front beam body 25 of the furnace body 23 and extends downward, and the front eave part 40 and the front door 30 constitute a front fireproof wall of the furnace body 23.

The front eave portion 40 has a plurality of notches 40a that are slightly larger than the half-mounted portion of the mounting flange portion 32a of the immersion lance 32, and crack prevention slits 4.
1 is bored, and a latch 42 for hanging a curtain-like sealing material (not shown) is attached to the upper part of the notch 40a.

43 is a sand seal member for maintaining airtightness between the cart 28 and the furnace body 23, and 44a and 44b are clamps that fasten the cart 28 and the furnace body 23 when the cart 28 is in the inserted state.

Next, the upper surface of the front door 30 is provided with a plurality of notches 30a that are slightly larger than the half-mounted portion of the mounting flange portion 32b of the immersion lance 32, and the front eaves 40
The notch 4a of the front door 30 and the notch 30a of the front door 30 form a window portion surrounding the head 32b of the immersion lance 32. Therefore, as described above, as shown in FIG. 1, the head 32a of the immersion lance 32 is held so as to protrude outside the oven through the window during the drying operation.

Next, FIG. 3 is a top view of the drying oven 22 of the present invention, where the burners 27a and 27b are connected to the opposing side walls 23
A and 23b are installed at non-opposing positions, that is, at asymmetric positions with respect to the furnace axis (indicated by A-A). 22b indicates the inner cavity.

33 is an internal refractory lining of the furnace body 22, 34 is a burner tile, and as mentioned above, the burner 2
7a and 27b are installed asymmetrically, and the exhaust pipe 26 is installed in the center of the ceiling, the combustion gas circulation inside the furnace is good, and the temperature difference between each part of the furnace is ±10 at an average temperature inside the furnace of 50 to 500℃. It was within ~20℃.

Furthermore, in the present invention, when a reflux experiment was conducted by covering the side surface of the pedestal 31 with a steel plate, it was possible to further reduce the temperature difference.

The operating procedure for the drying oven 22 is as follows: First, the trolley 28 is pulled out as shown in FIG. The assembled pedestal 31 is loaded onto the pedestal floor 28a using a crane.

Next, the trolley 28 is pulled into the inner cavity of the furnace body 23 using the wire rope pulling device 35,
The notch 40a of the front eave 40, the notch 30a of the front door 30, and the head 32 of the immersion lance 32, especially the pedestal 12
A fireproof sealing material such as asbestos, a fibrous fireproof material such as ceramic, glass, or slag, or a block molded product is filled into the gap created between the two, and the burners 27a and 27b are ignited to start drying.

Regarding the combustion control of the burners 27a and 27b, a control panel may be provided to control the temperature rise according to a preset temperature rise schedule, or an operator may control the temperature rise based on the display on the thermometer. Control operations may also be performed.

When the scheduled drying is completed, the immersion lance is taken out of the furnace by reversing the procedure described above.

That is, as explained above, the drying oven of the present invention has a mechanism for drying a large number of immersion lances at the same time, and in order to further improve workability, the immersion lances are mounted on a pedestal, and getting on and off the cart is performed on both of the pedestals. The cart is moved in and out of the furnace by a traction device, and the front of the cart is equipped with a front door that forms part of the furnace wall, and the structure is such that it is sealed when pushed in. Furthermore, it improves workability and reduces equipment costs.

In addition, in order to equalize the temperature inside the furnace and reduce the temperature difference between each part, burners are installed at asymmetrical positions on the side walls and an exhaust pipe is installed on the furnace ceiling to ensure that the gas flow inside the furnace is smooth and the objects to be heated are heated. It is heated evenly and then discharged.

The gas flow situation in such a furnace is extremely complex, and locally uneven heat areas are likely to occur.
As a result of repeated numerous experiments, the inventors of the present invention confirmed that the configuration of the present invention does not require the installation of an airflow stirring device, such as an in-furnace fan.

In other words, there is no fear of cracks occurring due to temperature differences when drying monolithic refractories, and even in measurements using multiple thermocouples, the temperature differences at various parts of the furnace are minimal, and active air agitation is considered. You can achieve your goal without it.

(Effects of the invention) The equipment cost of the drying oven of the present invention is 1/2 to 1/3 lower than that of conventional drying ovens, and the drying efficiency is not inferior at all.

Furthermore, since the structure is simple and workability is good, the work efficiency is extremely high, and furthermore, it is possible to safely handle huge immersion lances.

In addition, since the dedicated area is extremely small, it can be easily installed alongside existing factory equipment.

[Brief explanation of drawings]

FIG. 1 is a schematic side view of the drying oven according to the present invention;
FIG. 2 is a front view of the drying oven of the present invention, FIG. 3 is a top view thereof, and FIG. 4 is a schematic vertical sectional view of a conventional drying oven.

Claims (1)

[Scope of Claim for Utility Model Registration] A pedestal on which a plurality of immersion lances are mounted in parallel in a recumbent position, a pedestal on which the pedestal is placed such that the pedestal can be freely climbed on and off, and a front door for sealing at the end of the pedestal. A lance-loading truck movably mounted on a track via wheels, a traction device for pulling the lance-loading truck movably forward and backward, an exhaust pipe in the ceiling, and an asymmetric structure between opposite side walls. An immersion lance comprising a heat-resistant furnace body, which is equipped with a gas or liquid fuel combustion device at its position, has a lumen portion that receives the lance loading truck in a manner that allows the lance loading truck to move in and out, and forms a substantially sealed state when the lance loading truck is inserted. drying furnace.